Scilab Function
Last update : 8/6/2005

gainplot - magnitude plot

### Calling Sequence

  `gainplot(sl,fmin,fmax [,step] [,comments] )`
  `gainplot(frq,db,phi [,comments])`
  `gainplot(frq, repf [,comments])`

### Parameters

- `sl`: list (`syslin` SIMO linear system).
- `fmin,fmax`: real scalars (frequency interval).
- `step`: real (discretization step (logarithmic scale))
- `comments`: string
- `frq`: matrix (row by row frequencies)
- `db,phi`: matrices (magnitudes and phases corresponding to `frq`)
- `repf`: complex matrix. One row for each frequency response.

### Description

Same as Bode but plots only the magnitude.

### Examples

    s=poly(0,'s')
    h=syslin('c',(s^2+2*0.9*10*s+100)/(s^2+2*0.3*10.1*s+102.01))
    gainplot(h,0.01,100,'(s^2+2*0.9*10*s+100)/(s^2+2*0.3*10.1*s+102.01)')
    clf()
    h1=h*syslin('c',(s^2+2*0.1*15.1*s+228.01)/(s^2+2*0.9*15*s+225))
    gainplot([h1;h],0.01,100,['h1';'h'])

### See Also

`bode`, `black`, `nyquist`, `freq`, `repfreq`, `g_margin`, `p_margin`,